Dma Flow Diagram (Figure 4-5) - Real Time Devices AD1200 User Manual

. DMA Flow Diagram (Figure 4-5)
This flow diagram shows you how to take samples and transfer the data directly into the computer's memory.
You can use DMA channel I or 3 to transfer data to the computer's memory. The pacer clock can be used to set the
sampling interval.
Fig.4-5 - DMA Flow Diagram
Program 8255 PPI:
Pod B out
Clear Registers
(Reset)
Program 8254 TCO & TC1 for
desired transfer rates
Program DMA Controller
Enable DMA &
ExternalTrigger
DMA Done = 1?
Stop Program
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